$\displaystyle \int{\frac{d{\theta}}{cot{\theta}}$

The question was to solve the ODE

$\displaystyle cot{\theta}d{\rho} + {\rho}d{\theta}=0$

I was solving using variable separable and got to a point

$\displaystyle \int{\frac{d{\rho}}{{\rho}} + \int{\frac{d{\theta}}{cot{\theta}} = \int{0}$